Fuel-distributing device for multicylinder engines



Jan. 24, 1928.

A. U. S. DANIELSSON FUEL DISTRIBUTING DEVICE FOR MULTICYLINDER ENGINES Filed June 22, 1926 fl AZ. 5. Dame/65071 fiwemar Patented Jan. 24, 1928.

UNITED STATES PATENT oi-"ric a.

AXEL UNO SECURE DANIELSSON, 0F STOCKHOLM, SWEDEN,-ASSIGNOR TO AKTIEBOLA- GET ATLAS DIESEL, OF STOCKHOLM, SWEDEN.

FUEL-DISTRIBUTING DEVICE FOR MULTICYLINDER ENGINES.

"Application filed June 22, 1926, Serial 110 117,822, and in Sweden May 20, 1924.

For the distribution of fuel to the work ing cylinders of multi-cylinder internal combustion engines delivered by a pump common to the said cylinders, a slide-valve has been proposed located in the discharge channel of the pump and placing the said channel in communication alternately with passages leading to the cylinders. The said slide-valve, preferably cylindrical, has two portions of restricted diameter. In one of the terminal positions of the slide-valve one of the said portions is placed in front of the port of the discharge channel of the pump and the port of one of the delivery passages, while the unrestricted portion located be tween the said restricted portions covers the port of the second delivery passage. 1n the other terminal position of the slide-valve the second restricted portion of the same uncovers the port of said discharge channel and the port of the said second delivery passage, while the intermediate unrestricted portion covers the port of the discharge channel first mentioned. Uwing to the fact that in internal combustion engines especially of the solid injection type, in which liquid fuel is injected into the combustion chamber of the cylinders at a pressure of about 300 atmospheres, a great pressure of about 150 to 200 atmospheres still prevails iii-the delivery channels after the performance of the injecting operation, the result is that the said intermediate unrestricted portion of the slide-valve is subjected, when covering the ports of the delivery passages respectively to a considerable lateral pressure, which forces the slide-valve against the side of thevalve casing, so that the slidevalve runs stiffly and even sticks fast. The object of this invention is to remove the said disadvantage and for that purpose the said intermediate unrestricted portion of the slide-valve and the distance between the ports of the delivery passages are so adapted with relation to one another that the intermediate portion does not-cover the said ports in any position of the slide-valve. Owing to this arrangement the slide-valve is wholly balanced in any position, so that it is easily shifted. I in the accompanying drawing Fig. 1 shows in a side view and partially in section as much of an internal combustion engine as is necessary for explaining the invention. Fig. 2 shows ina side view and diagramfact that two ignitions are effected during each revolution of the crank shaft 2 of the engine, the plunger 1 must perform two working strokes during one revolution of the said shaft in order to feed fuel to each cylinder. In the form of execution shown in the drawing this is effected by the plunger 1 being driven by a cam disk 3 having a single projection and provided on an auxiliary shaft 1, which is rotated by the shaft 2 by means of a spur gearing 5 and 6 and at a number of revolutions twice as great, as the number of revolutions of the crank shaft 2. Between the cam disk 3 and the plunger 1 a head 8 is located, which is movable in a guide provided in the frame of the pump and carries a roller 7 bearing against the cam disk 3. Plunger 1 is forced against the said head 8 by a spring 9. j The spring actuated suction valve 10 of the fuel pump permits fuel to pass from the admission channel 11, and the spring actuated discharge valve 12 of the pump communicates through a channel 13 with a fuel distributor arranged in accordance with this invention and consisting of a cylindrical slide-valve movable in a casing 14 and having three piston shaped portions 15, 16 and 17. 1* rom the casing 14 two conduits 18 and 19 extend to the working cylinders respectively of the engine. Said slide-valve. is by a link 20 connected with a bell crank lever 22, which is pivoted at 21 and is acted" upon by the rod 23 of an eccentric 24 provided on the shaft 2. The central part 16 of the slide-valve co-operates with the dis.- charge channel 13 of the fuel pump in the following manner. As the slide-valve is shifted by the eccentric 2 1, the part 16, during the one working stroke of the slide, 1, is placed on the one side of the discharging channel 13 as shown in the drawing, so that the latter through the chamber 26 surrounding the restricted portion of the slide-valve located between the plunger parts 16 and 17 is connected with the pipe 19 communicating with one of the working cylinders of the engine. During the next stroke of the pump piston the saidpart 16 is moved to the opposite side of the discharge channel 13, so that the latter communicates with the chamber surrounding the restricted portion between the plunger parts 15 and 16 and with the pipe 18 leading to the second working cylinder of the engine. In this manner the part 16 puts the discharge channel 13 into communication with the two working cylinders alternately. The length of the part 16 is so adapted that the part does not cover in any of its terminal positions the ports of the pipes 18 and 19. Consequently, the slide-valve is never subjected to a lateral pressure from the fuel contained in the said pipes. Besides the slide valve is always subjected to the same fuel pressure in both directions axially. Consequently, the slide-valve is wholly balanced laterally as-well as axially, for which 'rea son the shifting of the same requires slight work. The slide-valve ground inits casing has a very long duration and requires slight inspection. The fuel quantity forced into each working cylinder is controlled by the suction valve 10 which simultaneously operates as an overflow valve and to the suction conduit returns fuel superfluous for the working stroke of the pistons respectively. Valve 10 is opened at the proper moment by aslidable rod 27, which by a spring is forced against a head 28, movable in a guide and acted upon by a cam-disk or an eccentric provided on the auxiliary shaft i and adjusted by a governor 29, shown diagrammatically. in Fig. 1. The fuel pump and the fuel distributor may, evidently, be combined in such manner, that the pump is acted upon by a'cam-disk provided on the crank shaft. 2. The location of the pump and the fuel distributor may easily be adapted to different engine types.

In four cylinder engines two fuel distributors for instance of the type shown in the drawing may be provided, which cooperate with a pump common to the same or with two pumps respectively.

I claim:

In a multi-cylinder internal combustion engine, a device for supplying fuel to-two delivery passages from a single pump, ineluding a pump provided with a discharge channel, a slide valve located in said discharge channel and having two portions of restricted diameter adapted to place said discharge channel in communication alternately with said delivery passages, the portion of the slide valve located between the restricted portions and the distance between the delivery passages being so adapted with relation to one another as to prevent covering of said delivery passages by said intermediate portion in any position of the valve.

In testimony whereof I have hereunto atfixed my signature.

AXEL UNO STURE DANIELSSON. 

